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Maxim > Products > Supervisors, Voltage Monitors, Sequencers > MAX792, MAX792L, MAX792M, ...

MAX792, MAX792L, MAX792M, MAX792R, MAX792S, MAX792T, MAX820, MAX820L, MAX820M, MAX820R, MAX820S, MAX820T

Microprocessor and Nonvolatile Memory Supervisory Circuits

Microprocessor and Non-Volatile Memory Supervisory Circuits

Overview

Technical Documents

Ordering Info

Status

Active: In Production.

Description

The MAX792/MAX820 microprocessor (µP) supervisory circuits provide the most functions for power-supply and watchdog monitoring in systems without battery backup. Built-in features include the following:

µP reset: Assertion of RESET and active-low RESET outputs during power-up, power-down, and brownout conditions. Active-low RESET is guaranteed valid for V_CC down to 1V.
Manual-reset input.
Two-stage power-fail warning: A separate low-line comparator compares V_CC to a preset threshold 120mV above the reset threshold; the low-line and reset thresholds can be programmed externally.
Watchdog fault output: Assertion of active-low WDO if the watchdog input is not toggled within a preset timeout period.
Pulsed watchdog output: Advance warning of impending active-low WDO assertion from watchdog timeout that causes hardware shutdown.
Write protection of CMOS RAM, EEPROM, or other memory devices.

The MAX792 and MAX820 are identical, except the MAX820 guarantees higher low-line and reset threshold accuracy (±2%).

Data Sheet

Download	Rev 4	(PDF, 348kB)
E-Mail

Key Features

Manual-Reset Input
200ms Power OK/Reset Time Delay
Independent Watchdog Timer-Preset or Adjustable
On-Board Gating of Chip-Enable Signals
Memory Write-Cycle Completion
10ns (max) Chip-Enable Gate Propagation Delay
Voltage Monitor for Overvoltage Warning
±2% Reset and Low-Line Threshold Accuracy (MAX820, external programming mode)

Applications/Uses

Computers: Desktop, Workstation, Server
Controllers
Critical µP Monitoring
Intelligent Instruments

Key Specifications:

Supervisors (1 Monitored Voltage)

Part Number

Reset Thresh.
(V)

Reset Out

t_RESET

Watchdog Feature

Watchdog Timeout

Supervisor Features

Reset Thresh. Accur.
(%)

I_CC
(µA)

Budgetary Price

min

@ +25°C

max

See Notes

MAX792

2.5 to 3.3

3.3 to 5.5

Active High

Active Low

Push-Pull

85ms to 300ms

Cap Adjustable

Input (WDI)

Input/Output (WDI/WDO)

1s to 2s

<1s

>2s

Adjustable

Manual Reset

Power Fail Comparator/Low Battery Detect

2.5

150

$3.67 @1k

MAX820

$4.05 @1k

See All Supervisors (1 Monitored Voltage) (274)

Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific prices and delivery, please see the price and availability page or contact an authorized distributor.

Diagram

Typical Operating Circuit

Product Guides

Microprocessor Supervisory (PDF)

Reliability Reports

Reliability Report:	MAX792.pdf
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Software/Models

none

Ordering Information

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Temperature:

Tape and Reel

Sample

Devices: 151-152 / 152

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Part Number	Free Sample	Buy	Status	Package: TYPE PINS FOOTPRINT DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
MAX820TESE-T			Active	N.SO;16 pin Land Pattern: Not Available	-40°C to +85°C	See data sheet
MAX820TMJE			Active	CDIP(N);16 pin;173.5 mm² Outline Drawing:21-0045 (PDF) Land Pattern: Not Applicable Use pkgcode/variation: J16-3*	-55°C to +125°C	RoHS/Lead-Free: No Materials Analysis